package feizhou.untils.tools;

import com.jcraft.jsch.*;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.util.Properties;
import java.util.Vector;

/**
 * sftp附件上传工具类
 *
 * @author <a href="mailto:wanglu@smartdot.com.cn">wanglu</a>
 * @since 1.0, 2021/7/9 18:13
 */
public class SFTPUtil {
    private transient static Logger log = LoggerFactory.getLogger(SFTPUtil.class);


    private static ChannelSftp sftp;
    private static Session session;// SFTP会话
    private static String username = "hd";// SFTP登录用户名
    /**
     * FTP 登录密码
     */
    private static String password = "hd";// SFTP登录密码
    /**
     * 私钥
     */
    private static String privateKey;
    /**
     * FTP 服务器地址IP地址
     */
    private static String host = "192.168.102.182";// SFTP主机服务器
    /**
     * SFTP 端口
     */
    private static int port = 22;//  SFTP端口 默认为22


    /**
     * 连接sftp服务器
     *
     * @throws Exception
     */
    public static void login() {
        try {
            JSch jsch = new JSch();
            if (privateKey != null) {
                jsch.addIdentity(privateKey);// 设置私钥
                log.info("sftp connect,path of private key file：{}", privateKey);
            }
            log.info("sftp connect by host:{} username:{}", host, username);

            session = jsch.getSession(username, host, port);
            log.info("Session is build");
            if (password != null) {
                session.setPassword(password);
            }
            Properties config = new Properties();
            config.put("StrictHostKeyChecking", "no");

            session.setConfig(config);
            session.connect();
            log.info("Session is connected");

            Channel channel = session.openChannel("sftp");
            channel.connect();
            log.info("channel is connected");

            sftp = (ChannelSftp) channel;
            log.info(String.format("sftp server host:[%s] port:[%s] is connect successfull", host, port));
        } catch (JSchException e) {
            log.error("Cannot connect to specified sftp server : {}:{} \n Exception message is: {}", new Object[]{host, port, e.getMessage()});
        }
    }

    /**
     * 关闭连接 server
     */
    public static void logout() {
        if (sftp != null) {
            if (sftp.isConnected()) {
                sftp.disconnect();
                log.info("sftp is closed already");
            }
        }
        if (session != null) {
            if (session.isConnected()) {
                session.disconnect();
                log.info("sshSession is closed already");
            }
        }
    }

    /**
     * 将输入流的数据上传到sftp作为文件
     *
     * @param directory    上传到该目录
     * @param sftpFileName sftp端文件名
     * @param input        输入流
     * @throws SftpException
     * @throws Exception
     */
    public static void upload(String directory, String sftpFileName, InputStream input) throws SftpException {
        try {
            sftp.cd(directory);
        } catch (SftpException e) {
            log.warn("===========directory is not exist");
            sftp.mkdir(directory);
            sftp.cd(directory);
        }
        sftp.put(input, sftpFileName);
        log.warn("========file:{} is upload successful", sftpFileName);
    }

    /**
     * 上传单个文件
     *
     * @param directory  上传到sftp目录
     * @param uploadFile 要上传的文件,包括路径
     * @throws FileNotFoundException
     * @throws SftpException
     * @throws Exception
     */
    public void upload(String directory, String uploadFile) throws FileNotFoundException, SftpException {
        File file = new File(uploadFile);
        upload(directory, file.getName(), new FileInputStream(file));
    }

    /**
     * 将byte[]上传到sftp，作为文件。注意:从String生成byte[]是，要指定字符集。
     *
     * @param directory    上传到sftp目录
     * @param sftpFileName 文件在sftp端的命名
     * @param byteArr      要上传的字节数组
     * @throws SftpException
     * @throws Exception
     */
    public void upload(String directory, String sftpFileName, byte[] byteArr) throws SftpException {
        upload(directory, sftpFileName, new ByteArrayInputStream(byteArr));
    }

    /**
     * 将字符串按照指定的字符编码上传到sftp
     *
     * @param directory    上传到sftp目录
     * @param sftpFileName 文件在sftp端的命名
     * @param dataStr      待上传的数据
     * @param charsetName  sftp上的文件，按该字符编码保存
     * @throws UnsupportedEncodingException
     * @throws SftpException
     * @throws Exception
     */
    public void upload(String directory, String sftpFileName, String dataStr, String charsetName) throws UnsupportedEncodingException, SftpException {
        upload(directory, sftpFileName, new ByteArrayInputStream(dataStr.getBytes(charsetName)));
    }

    /**
     * 下载文件
     *
     * @param directory    下载目录
     * @param downloadFile 下载的文件
     * @param saveFile     存在本地的路径
     * @throws SftpException
     * @throws FileNotFoundException
     * @throws Exception
     */
    public void download(String directory, String downloadFile, String saveFile) throws SftpException, FileNotFoundException {
        if (directory != null && !"".equals(directory)) {
            sftp.cd(directory);
        }
        File file = new File(saveFile);
        sftp.get(downloadFile, new FileOutputStream(file));
        log.info("file:{} is download successful", downloadFile);
    }

    /**
     * 下载文件
     *
     * @param directory    下载目录
     * @param downloadFile 下载的文件名
     * @return 字节数组
     * @throws SftpException
     * @throws IOException
     * @throws Exception
     */
    public byte[] download(String directory, String downloadFile) throws SftpException, IOException {
        if (directory != null && !"".equals(directory)) {
            sftp.cd(directory);
        }
        InputStream is = sftp.get(downloadFile);
        byte[] fileData = IOUtils.toByteArray(is);
        log.info("file:{} is download successful", downloadFile);
        return fileData;
    }

    /**
     * 删除文件
     *
     * @param directory  要删除文件所在目录
     * @param deleteFile 要删除的文件
     * @throws SftpException
     * @throws Exception
     */
    public void delete(String directory, String deleteFile) throws SftpException {
        sftp.cd(directory);
        sftp.rm(deleteFile);
    }

    /**
     * 列出目录下的文件
     *
     * @param directory 要列出的目录
     * @return
     * @throws SftpException
     */
    public Vector<?> listFiles(String directory) throws SftpException {
        return sftp.ls(directory);
    }

    public static boolean fileExist(String filePath) {
        try {
            SftpATTRS attrs = sftp.lstat(filePath);
            return true;
        } catch (SftpException e) {
            if (e.id == ChannelSftp.SSH_FX_NO_SUCH_FILE) {
                log.info("file {} not exist.", filePath);
            } else {
                log.error("Exception message is: {}", e.getMessage());
            }
        }
        return false;
    }

    public static void main(String[] args) throws SftpException, IOException {

        SFTPUtil.login();

        //判断文件是否存在
        boolean isflag = SFTPUtil.fileExist("/home/hd/temp/111.txt");


        File file = new File("C:\\Users\\26372\\Desktop\\temp\\test\\222.pdf");
        InputStream is = new FileInputStream(file);
//        //上传文件
        SFTPUtil.upload("/home/hd/temp/", "222111.txt", is);
//        SFTPUtil.logout();
    }
}
